Penetration depth study of LaOs4Sb12 : multiband s-wave superconductivity

• Main Authors: Panagopoulos, Christos, Tee, X. Y., Luo, H. G., Xiang, T., Vandervelde, D., Salamon, M. B., Sugawara, H., Sato, H., Chia, Elbert E. M.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Science::Physics::Electricity and magnetism
• Online Access: https://hdl.handle.net/10356/95111; http://hdl.handle.net/10220/9243
• Institution: Nanyang Technological University

We measured the magnetic penetration depth λ(T) in single crystals of LaOs4Sb12 (Tc=0.74 K) down to 85 mK using a tunnel-diode-oscillator technique. The observed low-temperature exponential dependence indicates an s-wave gap. Fitting the low-temperature data to a BCS s-wave expression gives the zero...